Automotive Radar Beamforming Interference Calibration
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Solution Overview
Problem
Conventional automotive radar systems face challenges in calibrating multifunctional radar transceivers to reduce interference among multiple transceivers, which affects their ability to accurately detect objects and communicate effectively.
Innovation Solution
The system employs a calibration technique that adjusts beamforming coefficients based on interference reports from transceivers, using iterative optimization algorithms to minimize side lobes and optimize antenna patterns, allowing for precise beamforming and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple multifunctional radar transceivers are deployed in an automotive system, then the functionality and coverage of the radar system is improved, but interference among transceivers increases
Solution Approach 1:
The patent segments the radar system into multiple transceivers, each with dedicated transmit and receive functions. By dividing the system into independent transceiver units positioned at different locations on the vehicle, each transceiver can operate semi-independently, reducing mutual interference while maintaining comprehensive coverage. The calibration process further segments the interference management by treating each transceiver pair's calibration independently through iterative optimization.
Solution Approach 2:
The patent implements a feedback mechanism where transceivers report interference levels to a central calibration system, which then adjusts beamforming coefficients accordingly. The calibration process uses iterative feedback loops where measured interference from side lobes is fed back to optimize beamforming weights, continuously reducing harmful interference while maintaining system functionality.
2Object-generated harmful factors
If beamforming coefficients are adjusted to reduce side lobes, then interference is minimized, but the calibration process becomes more complex
Solution Approach 1:
The patent performs preliminary calibration actions by pre-computing beamforming coefficients that minimize side lobe interference before actual radar operation begins. The calibration process establishes optimal weightings in advance, accounting for the specific geometric arrangement of transceivers and their expected interference patterns, thereby simplifying ongoing operation while achieving interference reduction.
Solution Approach 2:
The patent employs dynamic calibration where beamforming coefficients are adjusted iteratively based on measured interference levels. Rather than using fixed coefficients, the system dynamically optimizes weights through multiple calibration iterations, adapting the beamforming parameters to actual system performance and interference conditions, which balances complexity with effective interference management.
3Measurement precision
If calibration is performed to optimize antenna patterns, then object detection accuracy is improved, but the time required for calibration increases
Solution Approach 1:
The patent applies partial calibration by focusing optimization efforts on the most critical parameters that have the greatest impact on detection accuracy, rather than exhaustively optimizing all possible parameters. The calibration process performs a sufficient number of iterations to achieve acceptable performance without requiring excessive computation time, balancing precision with practical time constraints.
Solution Approach 2:
The patent optimizes calibration efficiency by strategically changing key parameters such as beamforming weights and antenna phase shifts during the calibration process. By identifying and optimizing the most influential parameters first, the system achieves significant improvements in detection accuracy with fewer calibration iterations, thereby reducing the time penalty associated with calibration.
Data Source
AI summary
A multifunctional radar transmitter may comprise bus interface circuitry and beamforming circuitry. The beamforming circuitry, with use of a plurality of beamforming coefficients, is operable to process a plurality of baseband signals to generate a millimeter wave radar burst corresponding to a radiation pattern that comprises a first lobe and a second lobe, where the first lobe is at a first angle and the second lobe is at a second angle. The bus interface circuitry is operable to receive, from a first receiver, an indication of interference from the second lobe present at the first receiver. The beamforming circuitry is operable to adjust, based on the indication of interference, the beamforming coefficients such that the second lobe is redirected to a third angle.